It’s clear at the top of the two Pac-12 divisions . . .

With the schedule winding down in 2013 Pac-12 football, the picture has mostly crystallized in each division. To wit:

North: Oregon is 6-1, Stanford 6-2. The Cardinal holds the tiebreaker over Oregon, but that only comes into play if the Ducks lose one of their final two, at Arizona this week or next week in Eugene against Oregon State. Two wins by Oregon, and the UO is the division champion and hosts the league-title game for the third straight year.

South: Arizona State is 6-1, UCLA 5-2 and USC 5-2. If ASU wins at UCLA Saturday, it’s done; the Sun Devils are South champs even if they lose against Arizona. If UCLA wins, the Bruins then grab the tiebreaker edge over ASU, but would need to conclude with a victory against USC to cinch the division. USC needs some breaks, in addition to having to win at Colorado Saturday. The Trojans would require a UCLA win over ASU to keep their hopes alive, then would have to beat UCLA and have Arizona upset ASU. USC loses in the head-to-head tiebreaker against the Sun Devils because of the Kiffin-killing 62-41 rout ASU put on USC Sept. 28. The race looks muddled, and any of three could win it, but there can’t be a three-way tie.

The Pac-12 title-game host role? It goes to the holder of the best league record, and if that’s a tie, to the winner of the head-to-head game. If the two didn’t play (Oregon and ASU didn’t), it goes to the higher team in the BCS standings.